Flashcards
Physics 2019 | SUMMER REVISION *keywords*
Flashcards do conjunto (62)
- 1What is a contact forceForce arising when objects are touching e.g. friction
- 2What is a non-contact forceForce that arises although objects are not touching, as in magnetism
- 3What are balanced forcesForces on an object that act in opposite directions and are equal in size
- 4What does equilibrium meanA state in which opposing forces are balanced
- 5What is a resultant forceA single force which has the same effect on an object as a set of forces it replaces
- 6What is a newtonA unit of force (N)
- 7What does fluid meanA substance that will flow e.g. liquids but also gases
- 8What is dragResistive force of air or water
- 9What does streamlined meanHas a shape that helps an object to move easily through a fluid with very little friction
- 10What does friction meanA force that opposes movement
- 11What does energy meanSomething has energy if it has the ability to make something happen when that energy is transferred
- 12What is compressionForce squashing or pushing together
- 13What is tensionA force applied to a material which tries to stretch it
- 14What is deformationChange of shape
- 15What is linear relationshipA relationship between two variables such that changing the independent variable causes the same change in the dependent variable e.g. doubling the first causes the second to double
- 16What is pressureForce on a certain area
- 17What is areaLength x width; units are squared
- 18What does depth meanDistance below the surface of a liquid
- 19What are moleculesTwo to thousands of atoms joined together. Most non metals exist either as small or giant molecules
- 20What is atmospheric pressureThe pressure exerted by the weight of air above that point
- 21What is heightThe vertical distance from the ground to the top of an object (if it is stood on the ground) or to the object (if it is suspended above the ground
- 22What are pascals (pa)Standard unit of pressure
- 23What is densityMass of a material per unit volume
- 24What is buoyancyUpward force on an object in a liquid
- 25What is upthrustUpward force exerted on an object in water
- 26What does displaced meanWhen an object is put into water it displaces some of the water
- 27What is a poleEnd of a magnet; may be the north pole or the south pole
- 28What does attract meanPull towards; a magnet will attract any magnetic material that is close enough
- 29What does repel meanPush away e.g. the north pole of a magnet will repel the north pole of another magnet
- 30What does field meanArea of electrostatic force around an object charged with static electricity
- 31What is a compasse
- 32What is a magnetic fieldSpace in which a magnetic material feels a force
- 33What is an electromagnetType of temporary magnet that is magnetic only when an electric current passes through it
- 34What is a solenoidA cylindrical coil of wire acting as a magnet when carrying electric current
- 35What is a corePiece of iron inside the coil of an electromagnet which makes the magnetic field stronger
- 36What is an armaturePole in an electromagnet or moving iron part of a solenoid, such as an electric bell
- 37What is contactPoint at which a circuit is made, for example a switch
- 38What is a circuit breakerDevice that breaks a circuit when too high a current flows
- 39What is a variableFactor whose value may be altered and which may affect the outcome of an experiment
- 40What does discrete meanA variable where only certain values are possible
- 41What does continuous meanA variable for which you can select any value
- 42What is a relationshipAn identifiable link between two variables, whereby changes in one seem to affect the other. It does not necessarily mean that one is causing the other
- 43What is a limitAn extreme value; going beyond the limit may cause a pattern or relationship between factors to break down
- 44What is a leverSimple machine that uses the turning effect of a force about a pivot
- 45What is workWork is done when energy is transferred, such as by a force acting over a distance
- 46What is a machineApparatus using mechanical power
- 47What is forceA push, pull, shear or turning effect; forces can be contact or non contact
- 48What is an input forceThe amount of effort put in
- 49What is an output forceThe force an object has as a result of an input force
- 50What is temperatureA measure of how hot an object is - e.g. in degrees Celsius
- 51What is degrees CelsiusDegrees Celsius is a measure of temperature; pure water freezes at 0 degrees and boils at 100 degrees C
- 52What is thermal energyThe energy in an object due to its temperature
- 53What is conductionTransfer of thermal energy in certain solids by the vibration of particles
- 54What is convectionThe movement caused in a fluid when hotter (less dense) material rises, and colder (denser), material sinks under the influence of gravity, resulting in transfer of thermal energy
- 55What is insulationA substance that will reduce how quickly thermal energy is transferred (thermal insulator) or will resist the flow of current (electrical insulator)
- 56What is radiationEnergy being transferred by waves. It can be electromagnetic (such as light or radio) or acoustic (such as sound)
- 57What is an insulatorDoes not allow a current to pass
- 58What are the features of metalsShiny, good conductor of electricity and heat, malleable and ductile, and usually solid at room temperature
- 59What are the features of non-metalsDull, poor conductor of electricity and heat, brittle and usually solid or gaseous at room temperature
- 60What is a thermal conductorA material that enables energy to pass through it quickly by the collision of particles
- 61What is a thermal insulatorA material that does not allow energy to pass through it quickly by the process of thermal conduction
- 62What is a conductorMaterial that allows thermal energy to be transferred through it easily
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